Therm-ic Extension Cords allow you to increase the length of the cord for your Therm-ic Boot Heaters by 120 centimeters. This makes a great option for skiers that would like to run their battery packs up the pant legs, to place them in your pockets. Therm-ic Extension Cords can also be used for anyone else who likes to use heaters, but does not have a place to attach them to their footwear.